9 October 2012 Femtosecond laser fabrication of gold nanorod/polymer composite microstructures
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Abstract
We present a fabrication method of gold nanorod/ polymer composite microstructures by means of a femtosecond near-infrared laser light. The mechanism of this method is based on a cooperation of two optical reactions; two-photon polymerization (TPP) reaction only at the surface of gold nanorods, and optical accumulation of gold nanorods in photo-polymerizable resin. Gold nanorods were mass-produced by seed mediated growth method, and were mono-dispersed in photo-resin. The wavelength of the laser light was tuned resonant to two-photon absorption of the photo-resin, and also close to a longitudinal local surface plasmon resonance (LSPR) mode of the gold nanorods. The laser light excited LSPR onto gold nanorods, resulting in the formation of thin polymer layer only at their surface through TPP. Concurrently occurring optical accumulation of gold nanorods by continuous irradiation of laser light, gold nanorods got together into focus spot. The TPP layer at the surface of gold nanorods worked as a glue to stick one another for forming their aggregated structure in micro/nano scale. By controlling the intensity and the exposure time of laser light, an optimal condition was found to induce dominant polymerization without any thermal damages. The scanning of the focus spot makes it possible to create arbitrary micro/nano structures. This method has a potential to create plasmonic optical materials by controlling the alignment of gold nanorods.
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Kyoko Masui, Satoru Shoji, Shota Ushiba, Xuan-Ming Duan, Satoshi Kawata, "Femtosecond laser fabrication of gold nanorod/polymer composite microstructures", Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 84571Y (9 October 2012); doi: 10.1117/12.930401; https://doi.org/10.1117/12.930401
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